You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
2.5 KiB
76 lines
2.5 KiB
// cmac.h - originally written and placed in the public domain by Wei Dai |
|
|
|
/// \file cmac.h |
|
/// \brief Classes for CMAC message authentication code |
|
/// \since Crypto++ 5.6.0 |
|
|
|
#ifndef CRYPTOPP_CMAC_H |
|
#define CRYPTOPP_CMAC_H |
|
|
|
#include "seckey.h" |
|
#include "secblock.h" |
|
|
|
/// \brief Enable CMAC and wide block ciphers |
|
/// \details CMAC is only defined for AES. The library can support wide |
|
/// block ciphers like Kaylna and Threefish since we know the polynomials. |
|
#ifndef CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS |
|
# define CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS 1 |
|
#endif // CRYPTOPP_CMAC_WIDE_BLOCK_CIPHERS |
|
|
|
NAMESPACE_BEGIN(CryptoPP) |
|
|
|
/// \brief CMAC base implementation |
|
/// \since Crypto++ 5.6.0 |
|
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CMAC_Base : public MessageAuthenticationCode |
|
{ |
|
public: |
|
|
|
virtual ~CMAC_Base() {} |
|
CMAC_Base() : m_counter(0) {} |
|
|
|
void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms); |
|
void Update(const byte *input, size_t length); |
|
void TruncatedFinal(byte *mac, size_t size); |
|
unsigned int DigestSize() const {return GetCipher().BlockSize();} |
|
unsigned int OptimalBlockSize() const {return GetCipher().BlockSize();} |
|
unsigned int OptimalDataAlignment() const {return GetCipher().OptimalDataAlignment();} |
|
std::string AlgorithmProvider() const {return GetCipher().AlgorithmProvider();} |
|
|
|
protected: |
|
friend class EAX_Base; |
|
|
|
const BlockCipher & GetCipher() const {return const_cast<CMAC_Base*>(this)->AccessCipher();} |
|
virtual BlockCipher & AccessCipher() =0; |
|
|
|
void ProcessBuf(); |
|
SecByteBlock m_reg; |
|
unsigned int m_counter; |
|
}; |
|
|
|
/// \brief CMAC message authentication code |
|
/// \tparam T block cipher |
|
/// \details Template parameter T should be a class derived from BlockCipherDocumentation, for example AES, with a block size of 8, 16, or 32. |
|
/// \sa <a href="http://www.cryptolounge.org/wiki/CMAC">CMAC</a> |
|
/// \since Crypto++ 5.6.0 |
|
template <class T> |
|
class CMAC : public MessageAuthenticationCodeImpl<CMAC_Base, CMAC<T> >, public SameKeyLengthAs<T> |
|
{ |
|
public: |
|
/// \brief Construct a CMAC |
|
CMAC() {} |
|
/// \brief Construct a CMAC |
|
/// \param key the MAC key |
|
/// \param length the key size, in bytes |
|
CMAC(const byte *key, size_t length=SameKeyLengthAs<T>::DEFAULT_KEYLENGTH) |
|
{this->SetKey(key, length);} |
|
|
|
static std::string StaticAlgorithmName() {return std::string("CMAC(") + T::StaticAlgorithmName() + ")";} |
|
|
|
private: |
|
BlockCipher & AccessCipher() {return m_cipher;} |
|
typename T::Encryption m_cipher; |
|
}; |
|
|
|
NAMESPACE_END |
|
|
|
#endif
|
|
|